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An EAAA spokesman said: "The EAAA crew, which last night included William, attended an incident south of Norwich which involved a road traffic collision-related injury, and a patient was treated at scene for severe head injuries then treated at Addenbrooke's Hospital."

The Duke of Cambridge decided to give up his civilian job earlier this year to become a full-time member of the Royal Family.

Until yesterday, Prince William worked a nine-and-a-half hour shift as part of a four days on, four off rota.